13201506779661 has 20 divisors (see below), whose sum is σ = 20880814647132. Its totient is φ = 8283298370688.

The previous prime is 13201506779641. The next prime is 13201506779663. The reversal of 13201506779661 is 16697760510231.

13201506779661 is a `hidden beast` number, since 1 + 3 + 2 + 0 + 1 + 506 + 7 + 79 + 6 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11626695122436 + 1574811657225 = 3409794^2 + 1254915^2 .

It is not a de Polignac number, because 13201506779661 - 2²⁵ = 13201473225229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13201506779598 and 13201506779607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13201506779663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4793574070 + ... + 4793576823.

Almost surely, 2^{13201506779661} is an apocalyptic number.

It is an amenable number.

13201506779661 is a deficient number, since it is larger than the sum of its proper divisors (7679307867471).

13201506779661 is an equidigital number, since it uses as much as digits as its factorization.

13201506779661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9587150922 (or 9587150913 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 13201506779661 in words is "thirteen trillion, two hundred one billion, five hundred six million, seven hundred seventy-nine thousand, six hundred sixty-one".